Let the python-twitter library handle message splitting

Twitter auto-converts urls to twitter shortened URLs. This can affect
the math for message splitting. The python-twitter library has this
implemented already, including all of the logic necessary ... so just
use it.

The character '\u2026' is the unicode horizontal ellipsis and is used
to indicate that the message is continued.

Change-Id: I5492a2792f5d11dccbe4a3454396262341449eab

statusbot/bot.py

@@ -56,7 +56,6 @@ import simplemediawiki
 import datetime
 import re
 import ssl
-import textwrap
 import twitter
 import urllib
 
@@ -200,15 +199,7 @@ class Tweet(UpdateInterface):
             access_token_secret=self.access_token_secret)
 
     def update(self, msg):
-        # Limit tweets to 120 characters to facilitate retweets
-        tweets = textwrap.wrap(msg, 120)
-        if len(tweets) == 1:
-            # Don't prefix statuses that fit
-            self.api.PostUpdate(tweets[0])
-        else:
-            for index in range(0, len(tweets)):
-                self.api.PostUpdate("{index}/{tweet}".format(
-                    index=index, tweet=tweets[index]))
+        self.api.PostUpdates(msg, continuation='\u2026')
 
     def alert(self, msg=None):
         self.update(msg)